EP1169140A1 - Procede de fabrication et d'amelioration de peintures - Google Patents

Procede de fabrication et d'amelioration de peintures

Info

Publication number
EP1169140A1
EP1169140A1 EP00910761A EP00910761A EP1169140A1 EP 1169140 A1 EP1169140 A1 EP 1169140A1 EP 00910761 A EP00910761 A EP 00910761A EP 00910761 A EP00910761 A EP 00910761A EP 1169140 A1 EP1169140 A1 EP 1169140A1
Authority
EP
European Patent Office
Prior art keywords
paint
spray device
basecoat
layer
retouching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00910761A
Other languages
German (de)
English (en)
Inventor
Winfried Kreis
Harry Libutzki
Hans-Joachim Streitberger
Gudrun Wiemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF Coatings GmbH
Original Assignee
BASF Coatings GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF Coatings GmbH filed Critical BASF Coatings GmbH
Publication of EP1169140A1 publication Critical patent/EP1169140A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/005—Repairing damaged coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field

Definitions

  • the present invention relates to a method for producing and repairing paintwork on objects, preferably vehicle bodies.
  • a base coat layer is produced on a substrate surface using a paint containing at least one effect substance
  • the basecoat is overcoated with a transparent lacquer
  • lacquers containing aluminum flakes are used as the lacquers containing effect substances for producing the base lacquer layer, then for example the widely used metallic effect lacquers are obtained.
  • Both the basecoat layer can be touched up with a transparent lacquer prior to overpainting, or the burned-in multi-layer lacquer coating with a lacquer containing at least one platelet-like pigment, in the latter case being overpainted again with a transparent lacquer and then baked again. It is very important that the repaired areas on the finished paintwork are not recognizable by differences in color and brightness.
  • at least the last spraying step for the production of the basecoat layer is carried out with the aid of a pneumatic application process in the case of automotive serial painting. These are usually so-called HVLP (high volume, low pressure) processes.
  • Pneumatic application methods are, however, disadvantageously characterized in that a relatively large part of the sprayed paint does not reach the substrate, with the result that the circulating air in the spray booth must have high speeds so that the relatively large amounts of overspray can be separated and disposed of .
  • EP 0 773 840 tries to avoid this problem by carrying out a very special painting process with precisely prescribed parameters. The process includes that the basecoat is applied electrostatically, and that the repair is carried out with the aid of pneumatic application under special conditions with regard to the droplet size and speed of the sprayed paint. Although this method can reduce the amount of overspray, it has been found that the touch-up is not sufficiently reproducible and there are undesirable color deviations between the base coat and the touched-up areas.
  • the present invention has set itself the task of avoiding the disadvantages of the prior art and to provide a method for producing and repairing coatings of objects which is simple and reproducible and in which no noticeable color deviations occur.
  • the process is said to be suitable for the production of multi-layer metallic effect coatings, with only small amounts of overspray being to be obtained.
  • This object is achieved by a process for touching up paintwork, in which new paint is applied to the damaged areas using a pneumatic spraying device, and which is characterized in that an electrical voltage is applied between the spraying device and the object to be touched up during the spraying process.
  • the electrical voltage causes an electrostatic attraction to pull the sprayed paint droplets toward the object to be painted.
  • the amount of overspray lost is therefore considerably smaller than without tension.
  • This influence of the application process on the color tone was surprising and may be due to the fact that the electrostatic field has an influence on the orientation of the metal particles in the effect lacquer.
  • the parameters of the electrostatic spray application according to the invention during the repair can essentially be selected as for the production of the basecoat.
  • the method according to the invention can be used in particular in the case of paint which contains effect metal particles, e.g. Aluminum plates included.
  • This can be water-based paint or conventional paints with organic solvents.
  • the electrostatic forces apparently have a positive effect on the orientation of the metal particles and thus on the color tone.
  • a waterborne basecoat is preferably processed with the method according to the invention. These are advantageous types of lacquer that are increasingly used.
  • the tension between the object to be repaired, e.g. a vehicle body, and the spray device can typically be 50 to 100 kV, the object being at a higher potential than the spray device.
  • the voltage is preferably selected in the same order of magnitude as when applying the base coating.
  • the invention further relates to a method for producing a coating, preferably a multi-layer effect coating, wherein
  • a basecoat film is produced on a substrate surface, - if necessary, the basecoat is overcoated with a transparent lacquer,
  • the basecoat film is preferably produced in an electrostatic application process.
  • the process according to the invention has the advantage that a uniform lacquer layer is obtained, in which repair areas are not recognizable.
  • the aim of the following example is to ensure a flawless painting process when first painting automobiles with metallic water-based paints (WBL) with the electrostatic gun REA III (ITW Ransburg endurentechnik GmbH, Dietzenbach, Germany).
  • the gun tip After switching on the high voltage, the gun tip must be held in the direction of the earthed part to be painted.
  • the high voltage is activated by pulling the gun lever.
  • the application takes place in a one-time order up to the opacity.
  • the fault current during painting must be in the range of 60 - 75 pA.
  • the product When repairing the defect, the product is pre-fogged dry and then blown dry before painting completely. The vehicle goes through the intermediate dryer. Thereby solvents and water escape. a) Processing water-based paint
  • the water-based paint is applied in one spraying step in the first investment zone "spray box fogging". After a short flash-off time, the painted part is evenly fogged out if necessary, so that no cloud formation occurs.
  • the second plant zone "spraying box pre-spraying" is not used.
  • the 2-component clear coat is then applied in the clear coat zone.
  • special spray guns are used (3 connections: air, hardener, clear lacquer), which have to be flushed with Acytyl before each break.
  • the dryer is then used to control the vehicle.
  • the ambient air temperature is approx. 100 ° C.
  • the vehicle After the dryer has run through, the vehicle is glued and the quality of the machined parts checked.
  • the criteria for this are color, spray pattern, curing, dirt, glued edges, runners, etc.
  • the vehicle is a return or whether it is controlled via the cooling zone in the paint finish for further processing.
  • the vehicles are processed accordingly at the paint finish, i.e. polished, mounted, fully reported, controlled.
  • humidifiable booths When processing water-thinnable basecoats (which also include the waterborne basecoat from series production), humidifiable booths must be used so that the color deviations in the assembly and spot paint repairs to be carried out during assembly differ by a maximum of 3-4 notes from the original painting (assessment according to DIN 53230 ).
  • Compressed air hose Compressed air hose, paint suit, paint gloves, paint helmet and hose, stopwatch, outlet bags, measuring cylinder, stir bar.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Cette invention concerne un procédé d'amélioration de peintures pour carrosseries de véhicules. On utilise un dispositif de pulvérisation pour appliquer une nouvelle couche de peinture sur les zones endommagées et, selon l'invention, on applique une tension électrique entre le dispositif de pulvérisation et l'objet durant le processus de pulvérisation. On applique de préférence le procédé d'amélioration dans le cadre de la réalisation de peintures fantaisie multicouches. Sur une surface de substrat, on réalise une couche de peinture de base par un procédé d'application électrostatique, on recouvre la couche de peinture de base d'une laque transparente et on effectue le séchage de la peinture ainsi obtenue. On effectue alors les améliorations nécessaires par le procédé de pulvérisation électrostatique de l'invention.
EP00910761A 1999-03-17 2000-03-03 Procede de fabrication et d'amelioration de peintures Withdrawn EP1169140A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19911802 1999-03-17
DE1999111802 DE19911802A1 (de) 1999-03-17 1999-03-17 Verfahren zur Herstellung von Ausbesserung von Lackierungen
PCT/EP2000/001840 WO2000054894A1 (fr) 1999-03-17 2000-03-03 Procede de fabrication et d'amelioration de peintures

Publications (1)

Publication Number Publication Date
EP1169140A1 true EP1169140A1 (fr) 2002-01-09

Family

ID=7901237

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00910761A Withdrawn EP1169140A1 (fr) 1999-03-17 2000-03-03 Procede de fabrication et d'amelioration de peintures

Country Status (4)

Country Link
EP (1) EP1169140A1 (fr)
AU (1) AU3285300A (fr)
DE (1) DE19911802A1 (fr)
WO (1) WO2000054894A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4218493A (en) * 1977-12-02 1980-08-19 The Continental Group, Inc. Electrostatic repair coating
EP0566958A1 (fr) * 1992-04-22 1993-10-27 Ball Corporation Méthode pour réparer un revêtement défectueux sur un substrat métallique
US5413809A (en) * 1993-07-01 1995-05-09 E. I. Du Pont De Nemours And Company Method for achieving recoat adhesion over a silane topcoat
JP2908695B2 (ja) * 1994-02-15 1999-06-21 日本ペイント株式会社 光輝性塗膜の補修用塗料および補修方法
JPH08157753A (ja) * 1994-12-01 1996-06-18 Nippon Paint Co Ltd 光輝剤含有塗膜の補修用塗料および補修方法
US5849365A (en) * 1997-02-18 1998-12-15 Basf Lacke + Farben, Ag Method for the production and repair of multicoat special-effect coating
JP2000000517A (ja) * 1998-06-15 2000-01-07 Kansai Paint Co Ltd 複層塗膜補修塗装法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0054894A1 *

Also Published As

Publication number Publication date
AU3285300A (en) 2000-10-04
DE19911802A1 (de) 2000-09-21
WO2000054894A1 (fr) 2000-09-21

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